src/thread/riscos/SDL_syscond.c
author Sam Lantinga <slouken@libsdl.org>
Fri, 17 Sep 2004 13:20:10 +0000
changeset 955 d74fbf56f2f6
child 1312 c9b51268668f
permissions -rw-r--r--
Date: Fri, 25 Jun 2004 13:29:15 +0100 From: "alan buckley" Subject: Modification for RISC OS version of SDL Ive attached a zip file with the changes to this email, it contains the following: The file sdldiff.txt is the output from cvs diff u. . The directory thread/riscos contains all the new files to support threading. Readme.riscos is a new readme file to add.
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997-2004 Sam Lantinga
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    This library is free software; you can redistribute it and/or
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    modify it under the terms of the GNU Library General Public
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    License as published by the Free Software Foundation; either
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    version 2 of the License, or (at your option) any later version.
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    This library is distributed in the hope that it will be useful,
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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    Library General Public License for more details.
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    You should have received a copy of the GNU Library General Public
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    License along with this library; if not, write to the Free
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    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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    Sam Lantinga
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    slouken@libsdl.org
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*/
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/* RISC OS implementations uses pthreads based on linux code */
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#ifdef SAVE_RCSID
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static char rcsid =
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 "@(#) $Id$";
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#endif
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#ifdef DISABLE_THREADS
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#include "../generic/SDL_syscond.c"
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#else
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#include <sys/time.h>
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#include <unistd.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <pthread.h>
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#include "SDL_error.h"
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#include "SDL_thread.h"
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#include "SDL_sysmutex_c.h"
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struct SDL_cond
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{
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	pthread_cond_t cond;
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};
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/* Create a condition variable */
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SDL_cond * SDL_CreateCond(void)
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{
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	SDL_cond *cond;
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	cond = (SDL_cond *) malloc(sizeof(SDL_cond));
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	if ( cond ) {
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		if ( pthread_cond_init(&cond->cond, NULL) < 0 ) {
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			SDL_SetError("pthread_cond_init() failed");
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			free(cond);
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			cond = NULL;
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		}
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	}
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	return(cond);
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}
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/* Destroy a condition variable */
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void SDL_DestroyCond(SDL_cond *cond)
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{
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	if ( cond ) {
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		pthread_cond_destroy(&cond->cond);
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		free(cond);
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	}
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}
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/* Restart one of the threads that are waiting on the condition variable */
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int SDL_CondSignal(SDL_cond *cond)
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{
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	int retval;
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	if ( ! cond ) {
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		SDL_SetError("Passed a NULL condition variable");
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		return -1;
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	}
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	retval = 0;
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	if ( pthread_cond_signal(&cond->cond) != 0 ) {
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		SDL_SetError("pthread_cond_signal() failed");
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		retval = -1;
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	}
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	return retval;
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}
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/* Restart all threads that are waiting on the condition variable */
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int SDL_CondBroadcast(SDL_cond *cond)
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{
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	int retval;
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	if ( ! cond ) {
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		SDL_SetError("Passed a NULL condition variable");
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		return -1;
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	}
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	retval = 0;
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	if ( pthread_cond_broadcast(&cond->cond) != 0 ) {
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		SDL_SetError("pthread_cond_broadcast() failed");
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		retval = -1;
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	}
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	return retval;
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}
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int SDL_CondWaitTimeout(SDL_cond *cond, SDL_mutex *mutex, Uint32 ms)
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{
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	int retval;
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	struct timeval delta;
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	struct timespec abstime;
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	if ( ! cond ) {
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		SDL_SetError("Passed a NULL condition variable");
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		return -1;
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	}
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	gettimeofday(&delta, NULL);
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	abstime.tv_sec = delta.tv_sec + (ms/1000);
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	abstime.tv_nsec = (delta.tv_usec + (ms%1000) * 1000) * 1000;
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        if ( abstime.tv_nsec > 1000000000 ) {
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          abstime.tv_sec += 1;
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          abstime.tv_nsec -= 1000000000;
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        }
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   128
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   129
  tryagain:
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	retval = pthread_cond_timedwait(&cond->cond, &mutex->id, &abstime);
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   131
	switch (retval) {
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   132
	    case EINTR:
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   133
		goto tryagain;
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   134
		break;
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   135
	    case ETIMEDOUT:
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   136
		retval = SDL_MUTEX_TIMEDOUT;
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   137
		break;
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   138
	    case 0:
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   139
		break;
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   140
	    default:
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   141
		SDL_SetError("pthread_cond_timedwait() failed");
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   142
		retval = -1;
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   143
		break;
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Sam Lantinga <slouken@libsdl.org>
parents:
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   144
	}
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   145
	return retval;
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   146
}
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   147
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   148
/* Wait on the condition variable, unlocking the provided mutex.
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   149
   The mutex must be locked before entering this function!
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   150
 */
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   151
int SDL_CondWait(SDL_cond *cond, SDL_mutex *mutex)
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   152
{
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   153
	int retval;
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parents:
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   154
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   155
	if ( ! cond ) {
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   156
		SDL_SetError("Passed a NULL condition variable");
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   157
		return -1;
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   158
	}
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parents:
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   159
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Sam Lantinga <slouken@libsdl.org>
parents:
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   160
	retval = 0;
d74fbf56f2f6 Date: Fri, 25 Jun 2004 13:29:15 +0100
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   161
	if ( pthread_cond_wait(&cond->cond, &mutex->id) != 0 ) {
d74fbf56f2f6 Date: Fri, 25 Jun 2004 13:29:15 +0100
Sam Lantinga <slouken@libsdl.org>
parents:
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   162
		SDL_SetError("pthread_cond_wait() failed");
d74fbf56f2f6 Date: Fri, 25 Jun 2004 13:29:15 +0100
Sam Lantinga <slouken@libsdl.org>
parents:
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   163
		retval = -1;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   164
	}
d74fbf56f2f6 Date: Fri, 25 Jun 2004 13:29:15 +0100
Sam Lantinga <slouken@libsdl.org>
parents:
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   165
	return retval;
d74fbf56f2f6 Date: Fri, 25 Jun 2004 13:29:15 +0100
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   166
}
d74fbf56f2f6 Date: Fri, 25 Jun 2004 13:29:15 +0100
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   167
#endif